bug#18196: 24.4.50; crash when setting face background in terminal frame

[martin rudalics]

> I don't mind these disadvantages, if what you describe is all of
> them.  (I don't know enough about the code involved to have my own
> opinion on the disadvantages.)

I hope I listed them all.

> So, unless you prefer the other alternatives, I have no objections to
> your going ahead with this one.

Fine.  I'll wait till I get a response from Mat Smiglarski.

Thanks, martin